How often do you have kids come in, particularly the very young ones, and when you greet them (Hi Johnny) they just walk on by?
We start out by teaching kids in class how to look us in the eye and give a polite greeting ("Hi Mr Anderson. How are you today sir?")Then, at the end of class, we call give them forward and give them a "Courtesy" sticker.
As instructors and studio owners, we all tell prospects that we teach self confidence, courtesy, etc. This is a concrete way you can demonstrate how you teach those martial arts attributes that parents can see for themselves.